PreviousNext No AccessSEG Technical Program Expanded Abstracts 2004String magnetic gradiometer system: recent airborne trialsAuthors: Wayne McRaeAlexey V. VeryaskinDavid GreagerLi JuDavid G. BlairEu‐Jeen ChinJean‐Charles DumasBen LeeWayne McRaeGravitec Instruments Ltd, New ZealandSearch for more papers by this author, Alexey V. VeryaskinGravitec Instruments Ltd, New ZealandSearch for more papers by this author, David GreagerIndustrial Research Ltd, New ZealandSearch for more papers by this author, Li JuUniversity of Western AustraliaSearch for more papers by this author, David G. BlairUniversity of Western AustraliaSearch for more papers by this author, Eu‐Jeen ChinUniversity of Western AustraliaSearch for more papers by this author, Jean‐Charles DumasUniversity of Western AustraliaSearch for more papers by this author, and Ben LeeUniversity of Western AustraliaSearch for more papers by this authorhttps://doi.org/10.1190/1.1845297 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract A novel sensor design for measuring magnetic gradient fields has been developed by Gravitec Instruments Ltd, New Zealand. The sensor features a single string element that reacts only to the gradient field, ignoring the much stronger total‐field of the Earth. Laboratory tests of the system show the room temperature noise floor is down to 0.1 nT/m over the measurement bandwidth of DC—1 Hz. For the current sensor design and room temperature operation, thermal noise is the dominant noise source. The signal to noise ratio can be enhanced further either by cooling the sensor down (∼ (T/300)½ fold noise decrease, where T is the operation temperature), or by increasing its length ((L0/L)32 fold noise decrease, where L0 = 250 mm is the current length of the string). The sensor is being tested in the field on‐board a geophysical survey aircraft to determine the noise floor outside the lab and to measure the gradient from the geological target at Gingin, Perth Australia.Permalink: https://doi.org/10.1190/1.1845297FiguresReferencesRelatedDetailsCited ByCommercial operation of a SQUID-based airborne magnetic gradiometerJonathan Rudd, Glenn Chubak, Hugo Larnier, Ronny Stolz, Markus Schiffler, Vyatcheslav Zakosarenko, Michael Schneider, Marco Schulz, and Matthias Meyer1 July 2022 | The Leading Edge, Vol. 41, No. 7Status and future perspectives of airborne magnetic gradiometryRonny Stolz, Markus Schiffler, Vyatcheslav Zakosarenko, Hugo Larnier, Jonathan Rudd, Glenn Chubak, Louis Polomé, Brad Pitts, Michael Schneider, Marco Schulz, Matthias Meyer, and Kit Campbell1 September 2021In situ MEMS gradiometer with nanometer-resolution optical detection systemSensors and Actuators A: Physical, Vol. 159, No. 1Optimizing a direct string magnetic gradiometer for geophysical explorationReview of Scientific Instruments, Vol. 80, No. 10Low magnetic susceptibility materials and applications in magnetic gradiometry10 August 2009 | Smart Materials and Structures, Vol. 18, No. 9Direct string magnetic gradiometer for space applicationsSensors and Actuators A: Physical, Vol. 147, No. 2 SEG Technical Program Expanded Abstracts 2004ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2004 Pages: 2586 publication data© 2004 Copyright © 2004 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 03 Jan 2005 CITATION INFORMATION Wayne McRae, Alexey V. Veryaskin, David Greager, Li Ju, David G. Blair, Eu‐Jeen Chin, Jean‐Charles Dumas, and Ben Lee, (2004), "String magnetic gradiometer system: recent airborne trials," SEG Technical Program Expanded Abstracts : 790-793. https://doi.org/10.1190/1.1845297 Plain-Language Summary PDF DownloadLoading ...

An enormous effort is underway worldwide to attempt to detect gravitational waves. If successful, this will open a new frontier in astronomy. An essential portion of this effort is being carried out in Australia by the Australian Consortium for Interferometric Gravitational Astronomy (ACIGA), with research teams working at the Australia National University, University of Western Australia, and University of Adelaide involving scientists and students representing many more institutions and nations. ACIGA is developing ultrastable high-power continuous-wave lasers for the next generation interferometric gravity wave detectors; researching the problems associated with high optical power in resonant cavities; opening frontiers in advanced interferometry configurations, quantum optics, and signal extraction; and is the world's leader in high-performance vibration isolation and suspension design. ACIGA has also been active in theoretical research and modelling of potential astronomical gravitational wave sources, and in developing data analysis detection algorithms. ACIGA has opened a research facility north of Perth, Western Australia, which will be the culmination of these efforts. This paper briefly reviews ACIGA's research activities and the prospects for gravitational wave astronomy in the southern hemisphere.